Manifold for internal-combustion engines



July 16, 1929. s. M DOWELL IANIFOLD FOR INTERNAL COMBUSTION ENGINES Filed Aug. ISO, 1926 3 Sheets-Sheet 1 II'III'IIIIIIIIIIII /61 H I NV EN TOR.

c ppzge ATTORNEY.

July 16, 1929. McDOWELL 1,720,683

MANIFOLD FOR INTERNAL COMBUSTION ENGINES Filed Aug. 30, 1926 3 Sheets-Sheet 2 w\\ R f a a W W w W m u .n i W L m M v 3 W 5 3 1 |W-L wlw k U ll g ///7 V y ATT NEY.

Juiy 16, 1929. G. M DOWELL MANIFOLD FOR INTERNAL COMBUSTION ENGINES 3 Sheets-Sheet 3 Filed Aug. 30, 1926 I NVENTOR. wfl

A TTORNE Y.

Patented July 16, 1929.

UNITED STATES PATENT OFFICE.

GEORGE MCDOWELL, OF FRANKLIN SQUARE, NEW YORK, ASSIGNOR OF ONE-HALF TO FRED GROZINGER, 0F BROOKLYN, NEW YORK.

MANIFOLD FOR INTERNAL-COMBUSTION ENGINES.

Original application filed December 18, 1925, Serial No. 76,306. Divided and this application filed August This invention relates to internal combustion engines and relates more particularly to the manifold construct-ion for engines of this type. T he objects of the invention are to provide a manifold construction in a single casting for the intake and exhaust gases. to provide a manifold with a pair of longitudinal chambers separated by a central wall in which the ports connecting with the engine cylinder are located and to provide a combined exhaust and intake manifold which is secured to the engine head by a row of bolts located between the ports. Other objects of the invention are more particularly pointed out in the following specification and claims and illustrated in the accompanying drawings, in which, Fig. 1 a front elevation of the manifold complete with the carburettor in place, Fig. is a vertical cross-section of Fig. 1 taken on the line 2-2 of Fig. Fig. 3 is a vertical section of an engine head with the manifold in place, Fig. 4 is a horizontal section on the line of Fig. 3, Fig. 5 is a sectional elevation of the engine head with the manifold sectioned onthc exhaust port and Fig. 6 is a vertical section of the engine head with the manifold sectioned on the intake passage.

The present invention embodies in a sin gle casting a longitudinal passage for the intake gases and a longitudinal passage for the exhaust gases for a multiple cylinder engine. These passages are separated by a central wall in which the intake and exhaust ports connecting with corresponding ports in the engine head, are alternately spaced, one set of ports connecting with the intake passage and the other set of ports connecting with the exhaust passage. Between the ports a boss is provided which is drilled for the attaching stud bolts. Projecting from the wall of the exhaust port into the intake passage are fins or baflle plates which are heated by the exhaust gases and which cause a pie-heating and thorough mixing of the intake gases before entering the cylinder. The manifold is divided transverse 1y into sections each section having its own carburetter and exhaust pipe connection, so that the cylinders connected with each section. operate as an independent unit. The entire manifold is water-jack ted with a continuous wateejacket.

Serial No. 132,597.

This invention is a division from my copending application, Serial N 0. 76,306, filed December 18, 1925.

In the drawings, 11 is the exterior casing of the manifold which is secured to the engine head by the stud bolts 12 which pass through the boss 13 in the central ridge of the device. The exhaust pipe is connected at 14 and 15 is the intake pipe from the carburetter 16. The end of the pipe 15 is formed in a flange 17 with an extension which enters chamber 21 as shown in Fig. 6. This flange has slots 19 through which it is secured to the casting by the bolts 18. It will be noted that these slots permit a rotary adjustment of the pipe 15 so that the carburetter with its float can be levelled after the engine is set at an angle as ordinarily occurs, for instance, in motor boats.

The pipe 15 through the intake passage 21 leads to the longitudinal chamber 22 form ing the intake chamber or manifold which is separated by the central wall or ridge 25 from the exhaust chamber or manifold 27 leading to the exhaust opening 26. The intake orts 23 open directly into the intake cham er 22 where the intake gases are mixed and pre-heated by the heat from the exhaust gases through the wall 25 and by the fins or bafiles 24 which project from the walls of the exhaust ports into the chamber 22.

These fins absorb heat from the exhaust and cause a mixing and heating of the intake gases in chamber 22.

The exhaust ports 28 open directly into the exhaust chamber 27 and are alternately spaced with the intake ports which open in the opposite direction into chamber 22. It will be noted that the exhaust and intake ports and the bosses 13 are centered on the line of the dividing wall 25 which separates the manifold into a lower intake chamber and an upper exhaust chamber.

This manifold is arranged for a plurality of cylinders, each pair of ports represent-ing a cylinder and is divided transversely into sections as will be noted by the separation of the chamber 22 from the chamber 22* and the chamber 27 from the chamber 27 Each section is provided with a separate carburettor intake and a separate exhaust connection. so that, in fact, this transverse division. separates the cylinders connected. with each section into independent units.

This manifold is water-jacketed by a continuous water jacket as at 29 which passes around the intake and exhaust chambers and the various sections of the manifold and is connected with the water cooling system. This Water-jacket is particularly desired where engines are exposed as in motor boats to prevent injury to those coming into contact with the engine.

The engine head is indicated by all which is water-jacketed by the pockets 4-2 and has the cylinder head formed therein as at 43. A valve chamber sll leads from the intake and exhaust valves through the deflected passage into the cylinder head 43. The valves are operated by a cam shaft (not shown) through the valve guide 49. The stem 4:7 operates the intake valve 46 and the stem i8 operates the exhaust valve 46. Immediately over each valve the bonnet screw 54: is provided with the spark plug 55. The engine head is secured to the engine block by a double row of stud bolts through the bosses 53.

Itwill be noted from Fig. t that the intake port in the engine head 50 aligns with the intake port 23 of the manifold; also, the

exhaust port 51 in the engine head aligns with the exhaust port 28 of the manifold. These ports in the engine head are on the same horizontal plane and placed adjacent. They are separated by the wall 52 which is tapped to receive the stud bolts 12 which secures the manifold to the engine head. The exhaust port 28 in the manifold is deflected upwards to the longitudinal chamber 27 and the intake port 23 is deflected downwards to the longitudinal passage 22. Thus the ports from the upper and lower chambers of the manifold emerge on the same horizontal plane and align with the ports in the engine head.

. The engine head is assembled as indicated in Fig. 5 on top of the cylinder block 01 with the cylinder sleeve 62 inserted in the head at l3 and having the piston 63 and connecting rod 64: working therein.

It will be noted that the manifold may be removed as a unit from the engine head by releasing the stud bolts 12; also the engine head may be removed from the cylinder block without disturbing the manifold.

Having thus described my invention I claim:

1. A combined intake and exhaust 1nani-' fold for internal combustion engines comprising a unitary hollow casting divided in the middle by a longitudinal wall and hav ing a projecting rear portion matching with and bolting to the side of the cylinder head by a row of bolts passing through said wall, said wall dividing said manitold inte an upper exhaust chamber and a lower intake chamber, said intake chamber being rectangular in section and extending below the base of and spaced from the cylinder head a row of ports connecting said intake chamber with the intake valves and an alternately space-d row of ports connecting said exhaust chamber with the exhaust ports of the engine said ports being located on the line of said wall.

2. A combined intake and exhaust manifold for internal combustion engines comprising a unitary hollow casting having a head parallel with and spaced from the cylinder head with a projecting rear portion matching with and bolting to the cylinder head a wall dividing said casting longitudinally into an upper exhaust chamber and a lower intake chamber, each of said chambers being substantially uniform in cross section, a row of portsconnecting said intake chamber with the intake valves and an alternately spaced row of ports connecting said exhaust chamber with the exhaust ports of the engine, said ports being located on the line of said wall and a fin formed integral with the wall of each ofthe exhaust ports projecting into said intake chamber.

In testimony whereof I afiix my signature.

GEORGE MODONELL. 

